September 22, 2016
Dr. Joshua Sangoro gave an invited talk for the Stevens Institute of Technology ChemE and MatSci Department in Hoboken, NJ.
September 16, 2016
Tyler Cosby gave an invited talk at BDS 2016 in Pisa, Italy.
September 9, 2016
Congratulations to Maximilian Heres for his new article published in ACS Macro Letters.
Probing Nanoscale Ion Dynamics in Ultrathin Films of Polymerized Ionic Liquids by Broadband Dielectric Spectroscopy
Continuous progress in energy storage and conversion technologies necessitates novel experimental approaches that can provide fundamental insights regarding the impact of reduced dimensions on the functional properties of materials. Here, we demonstrate a nondestructive experimental approach to probe nanoscale ion dynamics in ultrathin films of polymerized 1-vinyl-3-ethylimidazolium bis(trifluoromethylsulfonyl)imide over a broad frequency range spanning over 6 orders of magnitude by broadband dielectric spectroscopy. The approach involves using an electrode configuration with lithographically patterned silica nanostructures, which allow for an air gap between the confined ion conductor and one of the electrodes. We observe that the characteristic rate of ion dynamics significantly slows down with decreasing film thicknesses above the calorimetric glass transition of the bulk polymer. However, the mean rates remain bulk-like at lower temperatures. These results highlight the increasing influence of the polymer/substrate interactions with decreasing film thickness on ion dynamics.
Proton Transport in Imidazoles: Unraveling the Role of Supramolecular Structure
The impact of supramolecular hydrogen bonded networks on dynamics and charge transport in 2-ethyl-4-methylimidazole is investigated. It is observed that the supramolecular structures are disrupted upon addition of minute amounts of levulinic acid while ionic conductivity is enhanced 10-fold.
Rapid and Facile Formation of P3HT Organogels via Spincoating: Tuning Functional Properties of Organic Electric Thin Films
Poly(3-hexyl thiophene) (P3HT) is widely regarded as the benchmark polymer when studying the physics of conjugated polymers used in organic electronic devices. Here, a novel set of conditions is identified and discussed for P3HT organogel network formation via spin coating by monitoring the spin-coating process from various solvents.